Thorchain: handle memo-less savers action parsing

[kaladinlight]

Overview

Thorchain tx parsing was recently added for utxos, but it was discovered that we aren't handling parsing of memo-less savers transactions (deposit and withdraw). To make things lighter on the back end, we can add memos to our savers transactions for easier detection, however, we would still ideally like to parse memo-less transactions, so we should still add logic to handle this.

References and additional details

https://dev.thorchain.org/thorchain-dev/saving-guide/quickstart-guide

Acceptance Criteria

• query midgard for transactions that don't have op_return/input data (can we be smarter about this to not over query midgard on every transaction?)
• parse midgard response to return savers action

Need By Date

No response

Screenshots/Mockups

No response

Estimated effort

No response

[kaladinlight]

going to close since we have memos now and not mission critical